我想使用背景gps背景，并设置App寄存器以进行位置更新。 我希望我的应用程序不被系统杀死，但是10分钟我的应用程序已经关闭。
我的代码是：
#import "AppDelegate.h"
#import "ViewController.h"
@implementation AppDelegate
@synthesize locationManager;
- (void)dealloc
{
[_window release];
[_viewController release];
[super dealloc];
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(
NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentDir = [paths objectAtIndex:0];
NSString *logPath = [documentDir stringByAppendingPathComponent:@"decrypt.log"];
freopen([logPath cStringUsingEncoding:NSASCIIStringEncoding], "w", stderr);
timer_public = [NSTimer scheduledTimerWithTimeInterval:5*60
target:self
selector:@selector(locationManagerDidTimeout)
userInfo:nil
repeats:YES];
self.locationManager = [[CLLocationManager alloc] init];
[self.locationManager setDesiredAccuracy:kCLLocationAccuracyBest];
//self.locationManager.distanceFilter = kCLDistanceFilterNone; //report all movement
self.locationManager.distanceFilter = 1; //report all movement
self.locationManager.delegate = self;
[self.locationManager startUpdatingLocation];
late=0;
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
// Override point for customization after application launch.
self.viewController = [[[ViewController alloc] initWithNibName:@"ViewController" bundle:nil] autorelease];
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
return YES;
}
-(void)showNotificationWithAlertBody:(NSString *)alertBody object:(id)object objectkey:(NSString *)objectkey{
UILocalNotification *alarm = [[UILocalNotification alloc] init];
if (alarm) {
alarm.fireDate = [NSDate date];
alarm.timeZone = [NSTimeZone defaultTimeZone];
alarm.repeatInterval = 0;
alarm.soundName = UILocalNotificationDefaultSoundName;
alarm.alertBody =[NSString stringWithFormat:@" %f",[[UIDevice currentDevice]batteryLevel]];
// alarm.alertAction
// NSDictionary *infoDic = [NSDictionary dictionaryWithObject:object forKey:objectkey];
// alarm.userInfo = infoDic;
// UIApplication *app = [UIApplication sharedApplication];
// [app scheduleLocalNotification:alarm];
NSLog(@"alarm=%@",alarm);
[[UIApplication sharedApplication] presentLocalNotificationNow:alarm];
}
}
-(NSString *)returnTime_All:(NSDate *)date{
NSDate *dateStr=[NSDate dateWithTimeIntervalSince1970:[date timeIntervalSince1970]];
NSDateFormatter* formatter = [[[NSDateFormatter alloc] init]autorelease] ;
[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSString *strDate=[formatter stringFromDate:dateStr];
return strDate;
}
-(void)locationManagerDidTimeout
{
NSLog(@"time=%@", [self returnTime_All:[NSDate date] ] );
}
//retrieve the coordinate
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
NSLog(@"++++++++++++++++");
NSTimeInterval new=[[NSDate date] timeIntervalSince1970];
NSTimeInterval cha=new-late;
if( cha>=5*60){
// if ([newLocation horizontalAccuracy] > 0.0f && [newLocation horizontalAccuracy] <= 100.0f)
// {
late=[[NSDate date] timeIntervalSince1970]*1;
NSString *strLoc=[NSString stringWithFormat:@"latitude=%f longitude=%f",newLocation.coordinate.latitude,newLocation.coordinate.longitude];
NSData *imgData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:@"www.baidu.com"]];
NSString *str=[[NSString alloc]initWithData:imgData encoding:NSUTF8StringEncoding];
NSLog(@"str=%@",str);
[self showNotificationWithAlertBody:strLoc object:nil objectkey:nil];
}
}
- (void)backgroundHandler {
NSLog(@"### -->backgroundinghandler");
UIApplication* app = [UIApplication sharedApplication];
__block UIBackgroundTaskIdentifier bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
[app endBackgroundTask:bgTask];
bgTask = UIBackgroundTaskInvalid;
}];
// Start the long-running task
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
[self.locationManager stopMonitoringSignificantLocationChanges];
self.locationManager.delegate=self;
[self.locationManager startUpdatingLocation];
[NSThread sleepForTimeInterval:2];
[self.locationManager stopUpdatingLocation];
});
}
- (void)applicationDidEnterBackground:(UIApplication *)application
{
/*
Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
*/
// [ self.locationManager stopUpdatingLocation];
// [self.locationManager startMonitoringSignificantLocationChanges];
late=[[NSDate date] timeIntervalSince1970];
BOOL isInBackground = YES;
if ([UIApplication sharedApplication].applicationState == UIApplicationStateBackground)
{
isInBackground = YES;
[self backgroundHandler];
}
}
- (void)applicationWillEnterForeground:(UIApplication *)application
{
// Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
if (self.locationManager==nil) {
self.locationManager = [[CLLocationManager alloc] init];
// self.locationManager.distanceFilter = kCLDistanceFilterNone; //report all movement
[self.locationManager stopMonitoringSignificantLocationChanges];
[self.locationManager setDesiredAccuracy:kCLLocationAccuracyHundredMeters];//精确度
}
[self.locationManager stopMonitoringSignificantLocationChanges];
self.locationManager.delegate=self;
[self.locationManager startUpdatingLocation];
}
- (void)applicationDidBecomeActive:(UIApplication *)application
{
// Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}
- (void)applicationWillTerminate:(UIApplication *)application
{
// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
NSLog(@"### -->applicationWillTerminate");
}
@end
答案 0 :(得分：1)
使用计时器（当应用程序进入后台时暂停）将是一种错误的方法。
Apple强烈建议不要使用您应用的自我终止，因为用户可能会误以为您的应用已崩溃（然后在应用商店中留下有关您应用的错误反馈或评论）。
如果真的想要这样做，我会这样做的方式是 - 在发布时或应用程序进入后台时 - 设置你的变量或属性应用程序是未来10分钟的日期。
当您在后台模式下获得核心位置/ GPS更新时，如果当前日期/时间超出您之前保存的日期，则应用程序可以终止。
答案 1 :(得分：0)